While I agree that a sentry stone in Erillion, City of Bronze responds in kind with the other sentry stones with the phrase "We wish you to have this. We wish to be heard" and gives you A Sentry Shard.

The City of Bronze Sentry Stone is not part of the achievement for it gives you A Sentry Shard of Three. Also there are 8 shards to get and you have 9 zones listed.

I'm not sure exactly what language skill is required. My guess would be 88 as the tasks in Sepulcher require language 88 to request. At language 100, I had no problem - my friend with language 55 got the message "There is no response from the stone" in Sepulcher

Do you need to have max Alaran in order to begin this? Upon hailing "a worn sentry stone" in Sepulcher of Order while visible, I only receive a message in yellow saying "There is no response from the stone."